zoukankan      html  css  js  c++  java
  • JAXB 实现List接口

    JAXB and Choosing the List Implementation

     
    For elements with max occurs greater than one, JAXB will generate a java.util.List property and the underlying implementation will be java.util.ArrayList.  You can control which list implementation is used through internal and external schema annotations.  You can also use your own domain objects which gives you full control of your object model.  This post will discuss these different options.

    Option #1 - Default JAXB Generation
     
    We will use the following XML schema for this post:

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    <?xml version="1.0" encoding="UTF-8"?>
    <xsd:schema
        xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      
        <xsd:element name="customer">
            <xsd:complexType>
                <xsd:sequence>
                    <xsd:element 
                        name="phone-number" 
                        type="xsd:string" 
                        maxOccurs="unbounded"/>
                </xsd:sequence>
            </xsd:complexType>
        </xsd:element>
      
    </xsd:schema>

    Using the following command line:

    1
    xjc -d out customer.xsd

    JAXB will generate the following class.  This class has a java.util.List property with java.util.ArrayList as the underlying implementation:

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    package generated;
      
    import java.util.ArrayList;
    import java.util.List;
    import javax.xml.bind.annotation.XmlAccessType;
    import javax.xml.bind.annotation.XmlAccessorType;
    import javax.xml.bind.annotation.XmlElement;
    import javax.xml.bind.annotation.XmlRootElement;
    import javax.xml.bind.annotation.XmlType;
      
    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "", propOrder = {"phoneNumber"})
    @XmlRootElement(name = "customer")
    public class Customer {
      
        @XmlElement(name = "phone-number", required = true)
        protected List<String> phoneNumber;
      
        public List<STRING> getPhoneNumber() {
            if (phoneNumber == null) {
                phoneNumber = new ArrayList<String>();
            }
            return this.phoneNumber;
        }
      
    }
    </STRING>

    Option #2 - Customizing the Generation
     
    If you wish to control the underlying implementation you can use an external binding file.  We will use the bindings file below to change the underlying implementation to be java.util.LinkedList:

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    <jxb:bindings 
        version="2.1">
      
        <jxb:bindings schemaLocation="customer.xsd">
            <jxb:bindings node="//xs:element[@name='customer']/xs:complexType/xs:sequence/xs:element[@name='phone-number']">
                <jxb:property collectionType="java.util.LinkedList"/>
            </jxb:bindings>
        </jxb:bindings>
      
    </jxb:bindings>

    And the following XJC call:

    1
    xjc -d out -b binding.xml customer.xsd

    To get the following class instead:

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    package generated;
      
    import java.util.LinkedList;
    import java.util.List;
    import javax.xml.bind.annotation.XmlAccessType;
    import javax.xml.bind.annotation.XmlAccessorType;
    import javax.xml.bind.annotation.XmlElement;
    import javax.xml.bind.annotation.XmlRootElement;
    import javax.xml.bind.annotation.XmlType;
      
    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "", propOrder = {"phoneNumber"})
    @XmlRootElement(name = "customer")
    public class Customer {
      
        @XmlElement(name = "phone-number", required = true)
        protected List<STRING> phoneNumber = new LinkedList<STRING>();
      
        public List<STRING> getPhoneNumber() {
            if (phoneNumber == null) {
                phoneNumber = new LinkedList<STRING>();
            }
            return this.phoneNumber;
        }
      
    }
    </STRING></STRING></STRING></STRING>

    Option #3 - Using Your Own Domain Class
     
    Generally you should interact with the java.util.List interface whenever possible.  However in your own domain classes you are free to make your properties any of the java.util.List implementations you wish (perhaps to make use of calls like java.util.ArrayList.trimToSize()).
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    package com.example;
      
    import java.util.ArrayList;
    import javax.xml.bind.annotation.XmlAccessType;
    import javax.xml.bind.annotation.XmlAccessorType;
    import javax.xml.bind.annotation.XmlElement;
    import javax.xml.bind.annotation.XmlRootElement;
      
    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlRootElement(name = "customer")
    public class Customer {
      
        @XmlElement(name = "phone-number", required = true)
        protected ArrayList<STRING> phoneNumber;
      
        public Customer() {
            phoneNumber = new ArrayList<STRING>();
        }
      
        public ArrayList<STRING> getPhoneNumber() {
            return this.phoneNumber;
        }
      
    }
    </STRING></STRING></STRING>
  • 相关阅读:
    强化学习(David Silver)2:MDP
    【论文阅读-DL】《Understanding Black-box Predictions via Influence Functions》阅读
    强化学习(David Silver)1:简介
    【论文阅读-DL】《Understanding Black-box Predictions via Influence Functions》阅读
    生成模型和判别模型
    第6章:概率图模型
    基础算法问题
    【论文阅读-CTR】<<Optimized Cost per Click in Taobao Display Advertising>>阅读
    【论文阅读-对话系统】<<Neural Responding Machine for Short-Text Conversation>>阅读
    【读书笔记】——终极算法
  • 原文地址:https://www.cnblogs.com/likehua/p/2295799.html
Copyright © 2011-2022 走看看